[外语类试卷]大学英语六级模拟试卷57及答案与解析.doc

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1、大学英语六级模拟试卷 57及答案与解析 一、 Part I Writing (30 minutes) 1 For this part, you are allowed 30 minutes to write a short essay entitled Credit Cards in College Campus. You should write at least 150 words based on the chart and outline given below: 1. 根据图片描述某高校拥 有信用卡的学生所占比例的变化 2. 分析产生这些变化的原因 3. 分如何看待信用卡令后在学生中

2、的使用情况Credit Cards in College Campus 二、 Part II Reading Comprehension (Skimming and Scanning) (15 minutes) Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions attached to the passage. For questions 1-4, mark： Y (for YES) if the statement agrees w

3、ith the information given in the passage; N (for NO) if the statement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in the passage. 2 Aliens Are there other forms of life in the universe? The scientific search for extraterrestrial (ET) life form

4、s has been bolstered by two recent discoveries. First, the discovery of life forms in exotic environments on Earth indicates that life is very hearty and can adapt to the strangest and most hostile environments. Second, astronomers found planets orbiting stars besides our sun over 50 extrasolar plan

5、ets have been discovered as of 2001. Are there alien life forms on any of these planets? If alien life does exist, what might it be like? Would it be simple forms of life such as bacteria, viruses or algae, or more advanced, multi-cellular creatures, perhaps even intelligent beings? Would aliens be

6、animals, plants or have characteristics of both? Would they have arms and legs and walk upright as we do? Would they depend upon vision as their primary sense or use another way to gather information about their surroundings? Would they “breathe“ oxygen or some other gas? Greetings, Carbon-based Bip

7、eds(两足动物 )! Most of us picture alien life the way its portrayed in movies, where aliens are commonly depicted as human-like forms because they use actors either to play the roles directly in make up or to be models for computer-generated animation. Also, audiences relate to human-like aliens better

8、than to more exotic, monster like. However, the human body plan bilateral symmetry with one head, two legs and two arms stems from when early animals such as lizard, crocodile, or dinosaur colonized the Earths land masses, and it seems unlikely that such a shape would evolve on an alien world. So, l

9、ets forget Hollywood for the moment and look closely at the real science of astrobiology. Astrobiology is the scientific study of life in the universe. Astrobiologists seek to understand (among other things) how life arose and evolved on Earth, what governs the way life is organized and what makes a

10、 planet habitable. Astrobiology combines the disciplines of biology, chemistry, physics, geology and astronomy. Often, astrobiologists must use the information learned about life on Earth as a guide for studying life elsewhere. Lets examine some of the unusual things that we have learned from life o

11、n Earth: Life in the Extreme Up until about 30 years ago, it was believed that all life on Earth was dependent upon energy from the sun. Furthermore, it was thought that you would probably not find life where temperatures were extremely hot, like in geysers or hot springs, or extremely cold, like in

12、 the Antarctic desert. These ideas changed when oceanographers explored hydrothermal vents, openings in the ocean floor where extremely hot, mineral-rich water erupts from the crust. Hydrothermal vents are located several miles below the surface, on the ocean floor, where the surrounding water is at

13、 or near freezing, it is absolutely dark and the pressure is high. In organized communities around the bases of these vents, called black smokers, scientists found clams, crabs and exotic, giant tubeworms measuring 6 feet (2 meters) long. The water coming out of these vents is 230 to 662 degrees Fah

14、renheit (110 to 350 degrees Celsius). How can these animals survive so far from the sunlight, under these extreme conditions? In the water, scientists found species of bacteria that split hydrogen sulfide(硫化物 )from the water to get energy to make organic compounds. The tubeworms have bacteria in the

15、ir tissues that help them derive energy from the water. The clams feed on the bacteria, and the crabs feed on the tubeworms. The discovery of hydrothermal-vent communities showed that it is possible for life to evolve in places without light from the sun, and in other worlds without sufficient light

16、 from the parent star. In view of the discovery of hydrothermal vents, it may be possible that life exists on Europa, an icy moon of Jupiter, which scientists believe has a water ocean beneath its icy crust. Life has been found in other extreme environments as well. Scientists discovered microcoloni

17、es of lichens(地衣 ) called cryptoendoliths in rock samples of the Antarctic desert, where temperatures often drop to 100 degrees below zero and there is little or no liquid water. In contrast, thermophilic (heat-loving) bacteria have been found in hot springs where temperatures exceed the boiling poi

18、nt of water. If life can evolve in extreme environments on Earth, it seems possible that life may exist in the extreme environments of other worlds such as mars. Speculation: What Might Aliens be Like? Since no extraterrestrial life forms have been conclusively discovered, alien physiology lies in t

19、he realm of our imagination. Science-fiction authors, especially the “hard“ ones who try to adhere strictly to real science, have been doing this for years. They first design or build a world, carefully working out its physical, astronomical and ecological characteristics. Next, they work out what t

20、ype of aliens could exist in that world. An example of one such world-building exercise can be found at the Epona Project, where several science-fiction writers came together to create a world called Epona, complete with planetary, geological and ecological data. One artist, Steven Hanly, created Ep

21、ona creatures. For his novel “Mission of Gravity,“ Hal Clement created a world called Mesklin that circles a double star. Mesklin rotates once every eighteen minutes and has a flattened shape caused by its rotation. The gravity of Mesklin ranges from three times Earths gravity, at the equator, to se

22、ven hundred times at the poles. Mesklin has a hydrogen atmosphere and methane(甲烷 ) oceans. Mesklinites, one of the planets life forms, are small, centipede-like creatures made of an insect skeletal protein called chitin. They have 18 pairs of legs that end in sucker-like feet, forward pinchers for g

23、rasping, a strong circulatory system and absorb hydrogen right through their shells. They are immensely strong a result of living on a high-gravity world, yet they have a fear of being picked up because a fall from a small height could be fatal on such high gravity. Previously weve envisioned an ali

24、en world and alien life forms. In our world, the planet orbits a bright star. Only 10 percent of the world is covered with surface water, but throughout the land mass there are pockets of water that collect under the sands from the sparse rainfall. The enyironment is hot and arid and the sunshine is

25、 bright. The planet is massive and has gravity that is one-hundred times stronger than that of Earth. The atmosphere is an Earth-like air mixture of helium, oxygen and carbon dioxide. The two alien life forms that we envision for this world are animals mobile predators that live around the planets f

26、ew small bodies of surface water. Both aliens are short, about 1 foot (30 centimeters) tall, with thick limbs to support their weight against the immense gravity. Both have thick coverings or skins to minimize evaporation and conserve water. To gather information, one relies primarily on vision, whi

27、le the other uses chemical senses (taste and smell). The Lashlarm is our first alien predator. It looks like a walking toilet bowl. The mouth portion is supported by three stalky legs connected to a flat base. Underneath the base are many scales, so the base glides across the surface of the sand muc

28、h like a snake moves along the ground. It has several sensory appendages that allow it to locate prey by chemical means. It hunts near the small bodies of surface water, feeling along the waters edge and tasting the sand and water for other animals. Upon locating prey, the Lashlarm crouches down and

29、 glides up to it. The Lashlarm then opens its large mouth and springs down upon the prey, swallowing it whole. The Nirba is slightly larger than the Lashlarm. It lives in the water, near the edge, much like a crocodile or alligator but is not fully aquatic(水栖的 ). The Nirba comes out to prey on other

30、 animals that come down to the water, particularly the Lashlarm. It has a large head with nostrils located on top of its nose so it can breathe while mostly submerged. The Nirba has thick skin, to prevent dehydration while out of the water in the hot sun, and big, muscular front legs with large claw

31、s for killing its prey. A long tail helps it swim in the water, and the “arrowhead“ end assists in hunting and territorial defense. 2 There may be other life forms in the universe because over 50 extrasolar planets were discovered in 2001. （ A） Y （ B） N （ C） NG 3 In some movies where aliens are crea

32、ted as the enemy of human, they are usually monster-like creatures. （ A） Y （ B） N （ C） NG 4 Astrobiology, a branch science combining many other branches, studies the life on Earth. （ A） Y （ B） N （ C） NG 5 We used to believe that life could not exist under extremely hot or cold environment. （ A） Y （

33、B） N （ C） NG 6 The animals living in extreme oceanic environments have to feed on certain bacteria that help them get energy from_. 7 Because people have not convincingly found any alien life forms, such forms are just our_. 8 For creatures living under high-gravity condition in Hal Clements novel,

34、even a fall from a notvery-high place can be_. 9 In the extremely hot and dry environment, creatures are imagined to have _ to minimize loss of water and conserve it. 10 According to the authors imagination, in order to glide on the sand smoothly, the creature Lashlarm must have_. 11 With its body a

35、lmost totally under water, the Nirba can still breathe because its nostrils are on top of_ Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversat

36、ion and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. （ A） Attending the party. （ B） Visiting some friends. （ C） Studying for an exam. （ D） Taking an exam.

37、 （ A） The man has read her report and felt sorry about it. （ B） The man has destroyed her report by mistake. （ C） The woman has printed her report on the paper. （ D） The woman has finished her report on computer. （ A） Shes not sure how she was able to finish so early. （ B） She wasnt able to manage t

38、he project well. （ C） Shes not sure how to solve the mystery. （ D） She still hasnt heard what was shocking. （ A） There is a car accident on the highway, but nobody gets hurt. （ B） The lady in the car should be sent to hospital immediately. （ C） An ambulance is sent because a person gets badly hurt.

39、（ D） A car broke down and has to stay on the highway. （ A） The man brought the TV at a very low price. （ B） The man works in a store selling TVs. （ C） The mans words played a big role in the womans purchase. （ D） The man is not willing to buy the TV. （ A） Taxi-driver. （ B） Her husband. （ C） Airport

40、staff. （ D） Waiter. （ A） What they will do that afternoon. （ B） Working on an assignment together. （ C） How they will spend the weekend. （ D） Returning books to the library. （ A） She will go to work by bike. （ B） She will take a bus to the office. （ C） She will get to work by taxi. （ D） She will wal

41、k to the office. （ A） How to avoid making too many phone calls. （ B） The sons making long calls with his friends. （ C） How to make more money from the Saturday job. （ D） Who should pay half of the telephone bill. （ A） He should call his friends in the evenings. （ B） He should have another part-time

42、job. （ C） He should pay more attention to his lessons. （ D） He should talk to his friends in person. （ A） He does not agree and argues with her. （ B） He totally agrees and promises to cut down phone calls. （ C） He feels sorry but unwilling to pay half of the bill. （ D） He was scared but will go on m

43、aking long calls. （ A） How to get rich in a day. （ B） How to carry out reasonable investments. （ C） How to invest money in the future. （ D） How to set clear goals for the future. （ A） Make a saving plan. （ B） Set up a bank account. （ C） Set clear investing goals. （ D） Make clear why to invest. （ A）

44、The different kinds of investments. （ B） The importance of investments. （ C） The risks of the products and their potential rewards. （ D） The sum of investments. （ A） It is a good place to invest in. （ B） It has up times as well as down times. （ C） It is a place full of risks. （ D） It has more up tim

45、es than down times. Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A,

46、 B, C and D. （ A） Because they always win in the Olympic Games. （ B） Because they base their education on sports. （ C） Because they have many sports stars. （ D） Because they learn and play sports a lot. （ A） They help the students to become more cooperative. （ B） They are very good entertainment for

47、 students. （ C） They make lots of money buy selling tickets. （ D） They help the students to build good teams. （ A） They call out the names of players in their cheers. （ B） They jump and dance and shout for their team. （ C） They wear clothes of a bright color. （ D） They come from a special club. （ A）

48、 To get a little exercise. （ B） To take in some fresh air. （ C） Hoping to get something to eat. （ D） To visit the rich owner. （ A） He had not expected such a bold question from Pat. （ B） He wondered why Pat didnt run away. （ C） Pat wasnt afraid of him. （ D） Pat had a gun in his hands. （ A） Ordered P

49、at out of the wood. （ B） Warned Pat against shooting. （ C） Left Pat alone in the wood. （ D） Asked Pat to join them. （ A） Looking for food by themselves. （ B） Being fed properly. （ C） Overfeeding or underfeeding. （ D） Living on peoples odds and ends of table scraps. （ A） Run away and enjoy themselves. （ B） Be quite lazy and wouldnt do anything but sleep. （ C） Happily obey their masters. （ D） Demand better living conditions. （ A） Cats are very particular about places for rest. （ B） Cats are pret